1. The document provides safety tips for inspecting and testing computer systems and networks, including wearing proper protective equipment, disconnecting power sources before opening covers, and reporting any accidents. 2. Common network error messages are described along with potential solutions, such as checking that the network adapter is securely connected, renewing the DHCP lease on the router, and verifying wireless network settings and signal strength. 3. Steps for upgrading computer components like memory, video cards, hard drives, and processors are outlined to improve performance, along with tips for speeding up an existing computer through tasks like defragmenting and cleaning up storage.

1. Lesson 3. INSPECT AND TEST THE CONFIGURED COMPUTER SYSTEMS AND NETWORKS
General Safety Tips and Reminders
removed covers and other parts in a safe place, away from all personnel,while you are servicing the
machine.
Dress for the Job
an be trapped in the moving parts of a machine. Ensure that your sleeves are
fastened or rolled up above your elbows. If your hair is long, use hair net or hair cap.
tive clip, approximately
three (3) inches from the end.
-frame eyeglasses, or metal fasteners.
Replace any safety device that is worn out or defective.
Remember: Metal objects are good conductors
Electrical safety
Electric current from power, telephone, and communication cables can be hazardous. To avoid personal injury or
equipment damage, disconnect the attached power cords, telecommunications systems, networks and modems
before you open the server/workstation covers, unless instructed otherwise in the installation and configuration
procedure.
Precautions
Performing a mechanical inspection
Working near power supplies
Removing or installing main units
ine, unplug the power cord.
-off.
Moist floors
Non-grounded power extension cables
Power surges.
Switch off power
Send another person to get medical aid
Safety Inspection Guide
1. These steps will help you identify potentially unsafe conditions on electrical products:
-off computer. Disconnect the power cord.
ate type.
he power-supply cover fasteners (screws or rivets) have not been removed or tampered with.
Accident Reporting Policy and Procedure
Remember: One person's actions can jeopardize the
safety of others in the workplace.
Any accident, incident, or "near miss," no matter how
slight the injury or damage, must be reported to the
department supervisor immediately for appropriate
action. The supervisor is responsible for taking
appropriate follow-up action, including getting
medical attention for the injured, completing an
investigation report and recommending or

2. implementing appropriate corrective actions.
Accident Investigation Procedures
The senior staff member available at the accident scene or the first member notified should complete the
appropriate investigation reporting form (accident, incident, near miss). The completed form should be given to
the organization's safety committee, which will forward a copy of the report to the safety coordinator for review.
When an employee or volunteer is injured:
1. Get the person professional medical attention.
2. Protect others.
3. Minimize property damage.
4. Stabilize the situation.
5. Conduct an investigation.
General guidelines for investigating accidents:
elp preserve the scene (i.e., puddles on the floor, overturned storage shelves and spilled
contents).
-ended questions, one question at a time, and attempt to have events related chronologically
to ensure thorough coverage.
Avoid commenting on the
information gathered except to confirm your understanding or to clarify.
conversation around you.
icited comments often have merit.
communication with those involved.
-miss form, giving an accurate account of the facts.
Accident reports
Accident reports contain the following details:
of injury
Replacing different Components
Computer Parts Replacement
When replacing computer parts and peripherals, you need to consider the following factors:
1. Compatibility of the component or part
When replacing computer parts you should check if it is compatible with your unit. Double check
on your computer manual if the component you are replacing is compatible or not with the unit
because this may lead to system crash.
2. Consider the component specification
This focuses on the specification of the component. Check if the voltage rating, current rating,
memory size and frequency matches your computer unit.
3. Components form factor
The components’ manufacturer should be considered. Check if the unit you are trying to repair or
upgrade is generic or branded units. Branded units have their own set of components compatible
only to their units, while genetic types can be used only to generic type of units.
List of Components Commonly Replacedina Computer System

3. Memory-is technically any form of electronic storage; it is used most often to identify fast,
temporary forms of storage. It is commonly called RAM (Random Access Memory).
Video Cards-also referred to as a graphics accelerator, is an item of personal computer hardware whose function
is to generate and output images to a display.
Network Interface Card – is also known as LAN card. A PC interface to network cabling. It is a piece of computer
hardware designed to allow computers to communicate over a computer network
Hard disk drive – is a fixed computer storage medium
Motherboard – is also known as the mainboard. It contains circuits that perform various functions.
Processor – is also known as CPU or the Central Processing unit
CMOS Battery-Refers to a small memory on PC motherboards that is used to store BIOS settings.
CD/DVD Drive- A DVD is an optical disc storage mediaformat, invented and developed by Philips, Sony, Toshiba
and Panasonic in 1995.
Sound card - is an internal computer expansion card that facilitates he input and output of audio signals.
Upgrading Your Computer Components
Commonly Upgraded Computer Parts
1. Monitors- replace old CRT monitors to new LCD or LED monitors.
2. Optical drives- old CD-ROMs drives are commonly replaced with DVD-ROM and DVD writers.
3. Hard Drives- small capacity hard drives are replaced with faster and high capacity hard drives.
4. Keyboards and mouse- keyboards and mouse are commonly replaced with optical mouse and wireless
Keyboards.
5. RAM (Random Access Memory)- upgrading the computer’s memory or RAM speeds up the
performance of the computer.
6. Video cards- upgrade computer’s graphics card to improve the computer performance in terms of
graphics and games.
7. Processors- replacingthe processorsincreasethe dataprocessingspeed.
8. Modem- installingamodemenablesyourcomputertoconnectto the internet.
How to Speedup the Computer
1. Defragmenterutility:Automaticallyanalyzesthe emptydiskspace onthe hard diskanddefragall scatteredfiles.
2. Shutdown Unnecessary programs: Close all unwanted programs at the Windows start up and this will
automatically increase the windows loading time and speed of the computer will also be increased.
3. Increased memory: Increasing the memory in the system will result to exceptional speed of your computer.
4. Disk Cleanup: You can delete unwanted programs and files from your computer and this will be helpful in
increasing the speed.

4. 5. Empty Recycle Bin: Delete all the files and folders from the recycle bin and you will get the space of C drive for
reusability.
Memory Upgrade
To make your computer faster, you can upgrade its memory. Here are the steps in upgrading your computer’s
memory .
1. Remove the memory modules from the slot.
2. In Fig 35 the notches we have marked as A are used for the ejector
clip on the DIMMslot.
The notches we have marked as B are used to align the memory
module with the DIMMslot key C as
shown in Figure 36.
In Figure 36 youcan see the ejectorclips(D),usingyourfinger,push
these into the down position as shown in Figure 36 this allows the
memory to be inserted.
Videocard Upgrade Installingthe videocard
Hard Drive Upgrade
LESSON : 4TH GRADING continuation
Basic Network Errors
If your networkconnectionisnotconfiguredproperlyorsuffersatechnical failure,you will oftensee some errormessage
generatedanddisplayedonyour screen.These messagesgive helpful cluestothe nature of the issue.Use thislistof the
commonnetwork-relatederrormessagestohelptroubleshootandfix networking problems.
NetworkProblemerrorMessages
Network problemerror message 1
Box runningsoftware 14.8 and above:
No network adapter. (N01)
Please makesurethat yournetworkadapterissecurely
plugged into a USBport on the backof the box.
Box runningsoftware 14.7 and below:
A network adapter was not detected.(N01)
Please makesurethat yournetworkadapterissecurely
plugged into a USBport on the backof the box.
Possible solutionforerrormessage 1
Quick
Steps
1. If youhave a TiVoWirelessGor N Adapter:Remove the adapterfromthe TiVobox for 15 – 60
secondsandreconnect.Thenforce a connectiontothe TiVoservice.
2. Try anotherUSB port (whenapplicable).
3. If these stepshave notresolvedyourissue, see DetailedStepsbelow foradditional assistance.
Networkproblemerrormessage 2

5. Box runningsoftware 14.8 and above:
Problemwith router. (N03)
It mightbe temporarilyoutof IPaddresses.Waita few
minutes,andthentryconnectingagain.If the DHCP server
ispart of your home network,tryincreasingthe numberof
IP addressesitcanassign.
Box runningsoftware 14.7 and below:
The DHCP server was unable to supply an IP address.(N03)
It mightbe temporarilyoutof IPaddresses.Waita few
minutes,andthentryconnectingagain.If the DHCP server
ispart of your home network,tryincreasingthe numberof
IP addressesitcanassign.
Possible solutionforerrormessage 2
QuickSteps 1. Powercycle your network,thenforce aconnectiontothe TiVoservice.
2. Renewthe DHCP lease onyourrouter.
NOTE: Please contactyourroutermanufacturerif youare unsure how to dothis.
3. If these stepshave notresolvedyourissue,see DetailedStepsbelow foradditional assistance.
Networkproblemerrormessage 3
Box runningsoftware 14.8 and above:
Problemwith network settings.(N05)
Change yournetworksettingstouse a
different(andunused) IPaddress
Box runningsoftware 14.7 and below:
The specifiedIPaddress(<IP Address>) is already in use by
another device on the network. (N05)
Change yournetworksettingstouse a
different(andunused) IPaddress.
Possible solutionforerrormessage 3
QuickSteps 1. If the box is usinga staticIP address,thenitwill needtobe changed.See How toconfigure network
settingsonyourTiVobox for instructions.
2. Powercycle your networkdevices,thenforce aconnectiontotheTiVoservice.
3. Renewthe DHCP lease onyourrouter.
NOTE: Please contactyourroutermanufacturerif youare unsure how to dothis.
Networkproblem
error message 4
Box runningsoftware 14.8 and above:
WirelessNetworkNotFound.(N06)
Box runningsoftware 14.7 and below:
Couldnotconnectto the wirelessnetwork (<Network
Name>).(N06)
Possible solutionforerrormessage 4
Quicksteps 1. VerifyyourTiVobox hasthe latestsoftware versiontosupportthe encryptionusedbyyourrouter.
2. Make sure yourwirelessnetworkisoperational andyouhave sufficientsignal strengthwhere the box is
located.See Howto configure networksettingsonyourTiVobox forinstructions.
3. Verifyyouenteredthe correctthe correctname of your networkand/orthe correctencryptionkeyor
password.
4. Checkfor possible interference sourcesnearby,suchasmicrowave ovens,cordlessphones,etc.
5. Powercycle your networkdevices,thenforce aconnectiontothe TiVoservice.
6. Move your wirelessadaptertoimprove signal strength.
7. Contact your routermanufacturertodetermine whetheryouneedtoupdate yourrouterfirmware.
8. If these stepshave notresolvedyourissue,see DetailedStepsbelow foradditional assistance.

6. Protocol
Verifythatthe correct protocolsare installedonthe computer.Mostnetworks
todaywill utilizeTCP/IP,butmayalsoutilize orrequire IPX/SPXandNetBEUI.
Whenthe TCP/IPprotocol isinstalled,unlessaDNSserverorothercomputer
assigns the IPXaddress,the usermustspecifyanIP addressaswell asa Subnet
Mask. To do this,followthe instructionsbelow.
1. ClickStart / Settings/Control Panel
2. Double-clickthe Networkicon
3. Withinthe configurationtabdouble-clickthe TCP/IPprotocol icon.Note:Do
not clickon the PPPor Dial-Upadapter,clickonthe networkcardadapter.
4. In the TCP/IPpropertiesclickthe IPaddresstab
5. Selectthe optiontospecifyanIPaddress
6. Enterthe IPaddressand SubnetMaskaddress,an example of suchan
addresscouldbe:
IP Address:102.55.92.1
SubnetMask: 255.255.255.192